Miner s safety-lam p



( No Mcdel.)

W. J. MCDOWELL.

MINERS SAFETY LAMP;

No. 430,671. Patented June 24, 1890.

commodate the said tube.

UNITED STATES PATENT OFFICE.

WVILLIAM J MODOWVELL, OF SNOW? SHOE, PENNSYLVANIA.

MIN ERS SAFETY-LAM P.

SPECIFICATION forming part of Letters Patent No. 430,671, dated June 24,1890.

Application filed November 5, 1889. serial No. 329,269. (No model.)

To all whom, it may concern.-

Be it known that I, WILLIAM J. McDow- ELL, a citizen of the UnitedStates, residing at Snow Shoe, in the county of Centre and State ofPennsylvania, have invented a new and useful Miners Safety-Lamp, ofwhich the following is a specification.

This invention relates to miners safetylamps; and it has for its objectto construct a device of this class which shall be simple, durable, andinexpensive, and which shall be so constructed as to effectually preventits being tampered with by unauthorized persons.

The invention consists in the improved construction, arrangement, andcombination of parts, which will be hereinafter fully described,andparticularly pointed out in the claims.

In the drawings hereto annexed, Figure 1 is a perspective view of myimproved safetylamp. Fig. 2 is a vertical transverse sectional View ofthe same. Fig. 3 is a horizontal sectional view taken on the line or :1:in Fig. 2. Fig. 4 is a horizontal sectional view taken on the line y 'gin Fig. 2.

Like numerals of reference indicate like parts in all the figures.

The base 1 of the lamp, which forms the oilreservoir, is provided on itsupper side with an opening 2, surrounded by an annularinteriorly-screw-threaded flange 3.

4 designates the wick-tube, which. is provided with a horizontal annularflange 5, adapted to fit within the flange 3, where it is held securelyby means of an exteriorly-screwthreaded clamping-ring 6, the upper edgeof which is milled in order that it may be conveniently manipulated. Atube 7 extends from the bottom of the oil-reservoir upwardly through theopening 2, and the flange 5 of the wick-tube is provided with a notch 8to ac- The upper end of the wick-tube is provided with avertical slot 9,for the purpose to be hereinafter described.

10 designates a rod arranged to slide vertically through the tube 7, andhaving its lower end bent so as to form a handle 11. The upper end ofthe rod 10 is bent so as to form a U-shaped bracket 12, having anoutwardlyextending arm 13, the outer end of which is provided with alaterally-extending hook or point 14. It will be seen that bymanipulating the rod 10 the point 14 may be brought into engagement withthe wick 15 through the slot 9 in the wick-tube for the purpose ofraising or lowering the wick. It also may be used for the purpose ofremoving the burned portion of the wick by causing the arm 13 to sweepacross the upper end thereof. When not in use, the parts 13 and 14 maybe accommodated within the clamping-ring 6. The upper end of the base 1is exteriorly screwthreaded, as shown at 16, for the purpose ofconnecting it with the body of the lamp.

The body of the lamp is composed of two rings 17 18, which are connectedby means of vertical rods or bolts 19, extending through flanges 20 ofthe said rings, and the lower one of which is interiorly screw-threaded,as shown at 21. The upper ring 17 is provided with upwardly-extendingrods or bolts 22, to the upper ends of which is secured a metallic cap23, centrally to which is swiveled a hook or eye 24, by means of whichthe lamp may be held or suspended when in operation.

designates a cylindrical hood of wiregauze, closed at its upper end andhaving a lower conical portion 26. An additional cylindrical hood 27surrounds the cylindrical hood 25, thus making a double thickness ofWire-gauze.

28 designates an inverted, frustumshaped metallic tube, which isprovided near its lower end with an annular flange of wire-gauze 29. Thelatter fits against the base of the conical portion 26 of the hood 25,and the upper end of the tube 28 reaches to the intersection of thecylindrical hood 25 and its conical lower portion 26. The complete hood30, which is formed by the parts 25, 26, 27, 28, and 29, is fittedbetween the rods 22 of the upper portion of the lamp-body, and theflange 29 is caused to bear against a flange 31, formed interiorly uponthe ring 17 of the lamp-body.

designates the glass, which is cylindrical in shape and made of a veryheavy grade of the best glass procurable. This glass is fitted between apair of flanged packing-rings 32 and 33, between which and the ends ofthe glass packing 34 of asbestus or other suitable noncombustiblematerial is interposed. The lower flanged packing-ring 33 is exteriorilyscrew-threaded, as shown at 36, so as to engage the interiorscrew-thread 21 of the lower ringof thelamp-body. The said packing-ring33 is also provided with inwardly-extending radial lugs 37 to receive akey, by means of which the said packing-ring may be tightened orunscrewed, as the case may require.

The lower ring 18 of the lamp-body is provided with a laterallyextendinglug 38,

through which extends a set-screw 39, the inner end of which is adaptedto engage an annular groove 40, formed in the base of the lamp The outerend of the set-screw 39 has a perforation 41 to receive a pointedinstrument, by means of which it may be tightened, and the saidset-screw has a squared head 42, adapted to engage a slot 43 in aU-shaped clasp 44, which is adapted to fit over the head 42 and lug 38,thereby preventing the setscrew from turning.

The clasp 44 is in turn retainedin position by means of the padlock 45,the shaft of which may be passed through the perforation 39 in the headof the set-screw.

46 designates a hood of solid sheet metal, I which is adapted to fitover the outside of the upper portion of the lamp, and which is projvided at its upper edge with an inturned j flange 47, adapted to restupon the upper side of the cap 23. The said cap is provided with a notch48, adapted to engage a lug 49, ex-

tending inwardly from the upper end of the hood 46 below the flange 47of the latter. It Wlll thus be seen that by causing the lug 49 i to passthrough the notch 48 until the flange 47 rests upon the upper side ofthe cap 23,

and then giving the hood 46 a quarter-turn, it will be locked securelyin position. The hood 46 fits at its lower end around the ring 17 of thelamp-body, and it is provided at or near its upper and lower ends withventilating-perforations 50.

The operation and advantages of my improved safety-lamp will be readilyunderstood from the foregoing description, taken in con- .nection withthe drawings hereto annexed,

by those skilled in the art to which it apperiains. The generalconstruction of the device is simple and inexpensive, and theconstruction is such as to absolutely prevent access to the flame exceptby the person having charge of the key of the padlock 45. It will beobserved that the flame is guarded by a 27. The asbestus packing betweenwhich the.

ends of the glass are fitted will prevent danger of breakage by undueexpansion of the glass. It will also be seen that the wick may beconveniently raised or lowered, so as to regulate the flame bymanipulating the vertically-sliding rod 10.

I have herein described what I consider the preferred construction of myimproved safetylamp; but I would have it understood thatI reserve theright of making any such changes and alterations as maybe resorted towithout departing from the spirit of my invention.

Having thus described my invention, what I claim, and desire to secureby Letters Patent,

1. In a safety-lamp, the herein-described safety-hood, comprising theupper cylindrical hood 25, having a conical lower end, the exterioruppercylindrical hood 27, the invertedfrustuin-shaped sheet-metal tube28, having a gauze-flange 29, said tube 28 being fitted within theconical extension 26 of the hood 25, substantially in the manner and forthe purpose herein set forth.

2. In a safety-lamp, the combination, with the body, the lower ring ofwhich is provided with a laterally-extending lug 38, of a setscrewextending through said lug and having a transversely-perforated squarehead, a U- shaped clasp 44, having a slot 43 to receive the said squarehead, the lain ybase having an annular flange, and a padlock, allcombined, arranged, and operating substantially as and for the purposeherein set forth.

3. The combination, with the lamp-body comprising the rings 17 and 18,the packingrings 32 and 33, the glass 35, the connectingrods, and thecap 23, of the hood 30, the base or oil reservoir, and the exterior cap46, having an annular-flange 47, an inwardly-extending lug 49, adaptedto engage a notch 48 in the cap 23, and perforations 50, all arrangedand operating substantially as herein set forth.

In testimony that I claim the foregoing as my own I have hereto affixedmy signature in presence of two witnesses.

W'M. J. MCDOWELL.

\Vitnesses:

J. M. KEPHEART, W. S. HARTER.

